Method and apparatus for controlling air-fuel ratio in internal combustion engine
First Claim
1. A method of controlling air-fuel ratio of a gas mixture of air and fuel supplied to an internal combustion engine, in which an actual air-fuel ratio is determined on the basis of exhaust gas components of said engine by using air-fuel ratio detecting means installed in an exhaust gas system of said engine, the air-fuel ratio of said gas mixture to be supplied to said engine being controlled through a feedback control on the basis of deviation of said actually determined air-fuel ratio from a reference value thereof, said control method comprising a step of making a decision as to performance of said air-fuel ratio detecting means by making use of a change in the air-fuel ratio detection output of said air-fuel ratio detecting means at the time of at least one of interruption and restart of the fuel supply to said internal combustion engine.
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Accused Products
Abstract
In an air-fuel ratio control method and apparatus for an internal combustion engine supplied with a gas mixture of air and fuel, in which an actual air-fuel ratio is determined from exhaust gas components by using an O2 -sensor installed in an exhaust pipe of the engine, and the air-fuel ratio of the mixture gas to be supplied to the engine is controlled through feedback control on the basis of deviation of the actually detected air-fuel ratio from a reference value (A/F=14.7). Performance of the O2 -sensor is determined by making use of change in the air-fuel ratio output of the O2 -sensor at a time of interruption of the fuel supply to the engine or at a time the fuel supply to the engine is restarted.
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Citations
8 Claims
- 1. A method of controlling air-fuel ratio of a gas mixture of air and fuel supplied to an internal combustion engine, in which an actual air-fuel ratio is determined on the basis of exhaust gas components of said engine by using air-fuel ratio detecting means installed in an exhaust gas system of said engine, the air-fuel ratio of said gas mixture to be supplied to said engine being controlled through a feedback control on the basis of deviation of said actually determined air-fuel ratio from a reference value thereof, said control method comprising a step of making a decision as to performance of said air-fuel ratio detecting means by making use of a change in the air-fuel ratio detection output of said air-fuel ratio detecting means at the time of at least one of interruption and restart of the fuel supply to said internal combustion engine.
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5. Air air-fuel ratio control apparatus for an internal combustion engine, comprising:
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means for supplying a gas mixture of air and fuel to said internal combustion engine; air-fuel ratio detecting means installed in an exhaust system of said engine for detecting an actual air-fuel ratio; and means for controlling through a feedback control the air-fuel ratio of the mixture gas supplied from said gas mixture supplying means on the basis of deviation of said actual air-fuel ratio detected by said air-fuel detecting means from a reference value thereof, wherein said control means is further so arranged as to make a decision concerning performance of said air-fuel ratio detecting means by making use of a change in air-fuel ratio detection output of said air-fuel ratio detecting means at the time of at least one of interruption and restart of the fuel supply through said gas mixture supplying means. - View Dependent Claims (6, 7, 8)
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Specification